/* $NetBSD: set_keys.c,v 1.4 2023/06/19 21:41:44 christos Exp $ */
/*
* Copyright (c) 1997 - 2001, 2003 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kadm5_locl.h"
__RCSID("$NetBSD: set_keys.c,v 1.4 2023/06/19 21:41:44 christos Exp $");
/*
* Set the keys of `ent' to the string-to-key of `password'
*/
kadm5_ret_t
_kadm5_set_keys(kadm5_server_context *context,
hdb_entry *ent,
int n_ks_tuple,
krb5_key_salt_tuple *ks_tuple,
const char *password)
{
Key *keys;
size_t num_keys;
kadm5_ret_t ret;
ret = hdb_generate_key_set_password_with_ks_tuple(context->context,
ent->principal,
password,
ks_tuple, n_ks_tuple,
&keys, &num_keys);
if (ret)
return ret;
_kadm5_free_keys (context->context, ent->keys.len, ent->keys.val);
ent->keys.val = keys;
ent->keys.len = num_keys;
hdb_entry_set_pw_change_time(context->context, ent, 0);
if (krb5_config_get_bool_default(context->context, NULL, FALSE,
"kadmin", "save-password", NULL))
{
ret = hdb_entry_set_password(context->context, context->db,
ent, password);
if (ret)
return ret;
}
return 0;
}
static void
setup_Key(Key *k, Salt *s, krb5_key_data *kd, size_t kd_offset)
{
memset(k, 0, sizeof (*k)); /* sets mkvno and salt */
k->key.keytype = kd[kd_offset].key_data_type[0];
k->key.keyvalue.length = kd[kd_offset].key_data_length[0];
k->key.keyvalue.data = kd[kd_offset].key_data_contents[0];
if(kd[kd_offset].key_data_ver == 2) {
memset(s, 0, sizeof (*s));
s->type = kd[kd_offset].key_data_type[1];
s->salt.length = kd[kd_offset].key_data_length[1];
s->salt.data = kd[kd_offset].key_data_contents[1];
k->salt = s;
}
}
/*
* Set the keys of `ent' to (`n_key_data', `key_data')
*/
kadm5_ret_t
_kadm5_set_keys2(kadm5_server_context *context,
hdb_entry *ent,
int16_t n_key_data,
krb5_key_data *key_data)
{
krb5_error_code ret;
size_t i, k;
HDB_extension ext;
HDB_extension *extp = NULL;
HDB_Ext_KeySet *hist_keys = &ext.data.u.hist_keys;
Key key;
Salt salt;
Keys keys;
hdb_keyset hkset;
krb5_kvno kvno = -1;
int one_key_set = 1;
int replace_hist_keys = 0;
if (n_key_data == 0) {
/* Clear all keys! */
ret = hdb_clear_extension(context->context, ent,
choice_HDB_extension_data_hist_keys);
if (ret)
return ret;
free_Keys(&ent->keys);
return 0;
}
memset(&keys, 0, sizeof (keys));
memset(&hkset, 0, sizeof (hkset)); /* set set_time */
memset(&ext, 0, sizeof (ext));
ext.mandatory = FALSE;
ext.data.element = choice_HDB_extension_data_hist_keys;
memset(hist_keys, 0, sizeof (*hist_keys));
for (i = 0; i < n_key_data; i++) {
if (kvno != -1 && kvno != key_data[i].key_data_kvno) {
one_key_set = 0;
break;
}
kvno = key_data[i].key_data_kvno;
}
if (one_key_set) {
/*
* If we're updating KADM5_KEY_DATA with a single keyset then we
* assume we must be setting the principal's kvno as well!
*
* Just have to be careful about old clients that might have
* sent 0 as the kvno... This may seem ugly, but it's the price
* of backwards compatibility with pre-multi-kvno kadmin clients
* (besides, who's to say that updating KADM5_KEY_DATA requires
* updating the entry's kvno?)
*
* Note that we do nothing special for the case where multiple
* keysets are given but the entry's kvno is not set and not in
* the given set of keysets. If this happens we'll just update
* the key history only and leave the current keyset alone.
*/
if (kvno == 0) {
/* Force kvno to 1 if it was 0; (ank would do this anyways) */
if (ent->kvno == 0)
ent->kvno = 1;
/* Below we need key_data[*].kvno to be reasonable */
for (i = 0; i < n_key_data; i++)
key_data[i].key_data_kvno = ent->kvno;
} else {
/*
* Or force the entry's kvno to match the one from the new,
* singular keyset
*/
ent->kvno = kvno;
}
}
for (i = 0; i < n_key_data; i++) {
if (key_data[i].key_data_kvno == ent->kvno) {
/* A current key; add to current key set */
setup_Key(&key, &salt, key_data, i);
ret = add_Keys(&keys, &key);
if (ret)
goto out;
continue;
}
/*
* This kvno is historical. Build an hdb_keyset for keys of
* this enctype and add them to the new key history.
*/
for (k = 0; k < hist_keys->len; k++) {
if (hist_keys->val[k].kvno == key_data[i].key_data_kvno)
break;
}
if (hist_keys->len > k &&
hist_keys->val[k].kvno == key_data[i].key_data_kvno)
/* We've added all keys of this kvno already (see below) */
continue;
memset(&hkset, 0, sizeof (hkset)); /* set set_time */
hkset.kvno = key_data[i].key_data_kvno;
for (k = 0; k < n_key_data; k++) {
/* Find all keys of this kvno and add them to the new keyset */
if (key_data[k].key_data_kvno != hkset.kvno)
continue;
setup_Key(&key, &salt, key_data, k);
ret = add_Keys(&hkset.keys, &key);
if (ret) {
free_hdb_keyset(&hkset);
goto out;
}
}
ret = add_HDB_Ext_KeySet(hist_keys, &hkset);
free_hdb_keyset(&hkset);
if (ret)
goto out;
replace_hist_keys = 1;
}
if (replace_hist_keys)
/* No key history given -> leave it alone */
extp = hdb_find_extension(ent, choice_HDB_extension_data_hist_keys);
if (extp != NULL) {
HDB_Ext_KeySet *old_hist_keys;
/*
* Try to keep the very useful set_time values from the old hist
* keys. kadm5 loses this info, so this heuristic is the best we
* can do.
*/
old_hist_keys = &extp->data.u.hist_keys;
for (i = 0; i < old_hist_keys->len; i++) {
if (old_hist_keys->val[i].set_time == NULL)
continue;
for (k = 0; k < hist_keys->len; k++) {
if (hist_keys->val[k].kvno != old_hist_keys->val[k].kvno)
continue;
hist_keys->val[k].set_time = old_hist_keys->val[k].set_time;
old_hist_keys->val[k].set_time = NULL;
}
}
}
if (replace_hist_keys) {
/* If hist keys not given in key_data then don't blow away hist_keys */
ret = hdb_replace_extension(context->context, ent, &ext);
if (ret)
goto out;
}
/*
* A structure copy is more efficient here than this would be:
*
* copy_Keys(&keys, &ent->keys);
* free_Keys(&keys);
*
* Of course, the above hdb_replace_extension() is not at all efficient...
*/
free_HDB_extension(&ext);
free_Keys(&ent->keys);
free_hdb_keyset(&hkset);
ent->keys = keys;
hdb_entry_set_pw_change_time(context->context, ent, 0);
hdb_entry_clear_password(context->context, ent);
return 0;
out:
free_Keys(&keys);
free_HDB_extension(&ext);
return ret;
}
/*
* Set the keys of `ent' to `n_keys, keys'
*/
kadm5_ret_t
_kadm5_set_keys3(kadm5_server_context *context,
hdb_entry *ent,
int n_keys,
krb5_keyblock *keyblocks)
{
krb5_error_code ret;
int i;
unsigned len;
Key *keys;
len = n_keys;
keys = malloc (len * sizeof(*keys));
if (keys == NULL && len != 0)
return ENOMEM;
_kadm5_init_keys (keys, len);
for(i = 0; i < n_keys; i++) {
keys[i].mkvno = NULL;
ret = krb5_copy_keyblock_contents (context->context,
&keyblocks[i],
&keys[i].key);
if(ret)
goto out;
keys[i].salt = NULL;
}
_kadm5_free_keys (context->context, ent->keys.len, ent->keys.val);
ent->keys.len = len;
ent->keys.val = keys;
hdb_entry_set_pw_change_time(context->context, ent, 0);
hdb_entry_clear_password(context->context, ent);
return 0;
out:
_kadm5_free_keys (context->context, len, keys);
return ret;
}
/*
*
*/
static int
is_des_key_p(int keytype)
{
return keytype == ETYPE_DES_CBC_CRC ||
keytype == ETYPE_DES_CBC_MD4 ||
keytype == ETYPE_DES_CBC_MD5;
}
/*
* Set the keys of `ent' to random keys and return them in `n_keys'
* and `new_keys'.
*/
kadm5_ret_t
_kadm5_set_keys_randomly (kadm5_server_context *context,
hdb_entry *ent,
int n_ks_tuple,
krb5_key_salt_tuple *ks_tuple,
krb5_keyblock **new_keys,
int *n_keys)
{
krb5_keyblock *kblock = NULL;
kadm5_ret_t ret = 0;
int des_keyblock;
size_t i, num_keys;
Key *keys;
ret = hdb_generate_key_set(context->context, ent->principal,
ks_tuple, n_ks_tuple, &keys, &num_keys, 1);
if (ret)
return ret;
kblock = malloc(num_keys * sizeof(kblock[0]));
if (kblock == NULL) {
ret = ENOMEM;
_kadm5_free_keys (context->context, num_keys, keys);
return ret;
}
memset(kblock, 0, num_keys * sizeof(kblock[0]));
des_keyblock = -1;
for (i = 0; i < num_keys; i++) {
/*
* To make sure all des keys are the the same we generate only
* the first one and then copy key to all other des keys.
*/
if (des_keyblock != -1 && is_des_key_p(keys[i].key.keytype)) {
ret = krb5_copy_keyblock_contents (context->context,
&kblock[des_keyblock],
&kblock[i]);
if (ret)
goto out;
kblock[i].keytype = keys[i].key.keytype;
} else {
ret = krb5_generate_random_keyblock (context->context,
keys[i].key.keytype,
&kblock[i]);
if (ret)
goto out;
if (is_des_key_p(keys[i].key.keytype))
des_keyblock = i;
}
ret = krb5_copy_keyblock_contents (context->context,
&kblock[i],
&keys[i].key);
if (ret)
goto out;
}
out:
if(ret) {
for (i = 0; i < num_keys; ++i)
krb5_free_keyblock_contents (context->context, &kblock[i]);
free(kblock);
_kadm5_free_keys (context->context, num_keys, keys);
return ret;
}
_kadm5_free_keys (context->context, ent->keys.len, ent->keys.val);
ent->keys.val = keys;
ent->keys.len = num_keys;
if (n_keys && new_keys) {
*new_keys = kblock;
*n_keys = num_keys;
} else {
free(kblock);
}
hdb_entry_set_pw_change_time(context->context, ent, 0);
hdb_entry_clear_password(context->context, ent);
return 0;
}